18975870 has 112 divisors (see below), whose sum is σ = 54300240. Its totient is φ = 4758912.

The previous prime is 18975833. The next prime is 18975871. The reversal of 18975870 is 7857981.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18975871) by changing a digit.

It is a polite number, since it can be written in 55 ways as a sum of consecutive naturals, for example, 138442 + ... + 138578.

Almost surely, 2^18975870 is an apocalyptic number.

18975870 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is a practical number, because each smaller number is the sum of distinct divisors of 18975870, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (27150120).

18975870 is an abundant number, since it is smaller than the sum of its proper divisors (35324370).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

18975870 is a wasteful number, since it uses less digits than its factorization.

18975870 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 181 (or 166 counting only the distinct ones).

The product of its (nonzero) digits is 141120, while the sum is 45.

The square root of 18975870 is about 4356.1301633445. The cubic root of 18975870 is about 266.7271546812.

The spelling of 18975870 in words is "eighteen million, nine hundred seventy-five thousand, eight hundred seventy".